Audio Database


Pioneer SM-3000
100,000yen(around the 1971 time)

Stereo power amplifier of the highest-class specification which valued the delicate representation.

Large power and super-low-distortion-ization are realized until it banished all the interstage capacitors, it has adopted the 3 steps of whole page hardwired-connections Darlington pure complimentary OCL circuit system which adopted three-fold silicon diffusion type PNP and a NPN power transistor and it reaches a super-bass region from the first rank to a final stage.

DC potential has acquired the very high stability by adoption of the two-step differential amplifier.

What combined the electronic circuitry and power relay by nine transistors and 11 diode is adopted as a protection network, and it serves also as the power-source muting.

Two input terminals are carried and 4 position change is possible for Input sensitivity.
Moreover, three speaker outputs are carried.

The low cut-off filter of the sharp property of 12 dB/oct whose switching is possible for 7Hz and 20Hz is carried.

The survey data minutely checked for every set is attached.


Rating of a mode
Form Stereo power amplifier
Circuit system Whole page hardwired-connection pure complimentary OCL scheme
Music power (IHF) 400W (4ohm)
250W (8ohm)
Effective output
1kHz One-side-channel operation : 150W/150W (4ohm)
100W/100W (8ohm)
Both channel operation : 130W+130W (4ohm)
90W+90W (8ohm)

20Hz - 20kHz. Each-side channel operation: 85W+85W (8 ohms, 0.1% or less of distortion)
THD 0.1% or less (at the time of an effective output)
0.05% or less (at the time of 50W/50W output)
Cross modulation distortion 0.1% or less (at the time of an effective output)
0.05% or less (at the time of 50W/50W output)
Output bandwidth (IHF) 5Hz - 50kHz
Frequency characteristic 8Hz-70kHz+0 -1 dB
Input sensitivity/impedance
(At the time of an effective output 1kHz)
Load impedance 4ohm-16ohm
Dumping factor 100 (8 ohm, 1kHz) or more
A hum, a noise 95dB or more
A low filter 7Hz, a 20Hz switching type, 12dB / oct
An attached circuitry Input selector: 1, 2
Input-sensitivity selector: 0.5V, 1V, 2V, 5V
Speaker selector
Protection network indicator
Power consumption Rate: 165W
Maxima: 500W
Dimensions Width 422x height 172x depth of 288mm
Weight 15.1kg